ARC: Don't memzero twice in dma_alloc_coherent for __GFP_ZERO

alloc_pages_exact() get gfp flags and handle zero'ing already

And while it, fix the case where ioremap fails: return rightaway.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index 74a637a1cfc4..57706a9c6948 100644
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c
@@ -60,8 +60,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
 
         /* This is kernel Virtual address (0x7000_0000 based) */
         kvaddr = ioremap_nocache((unsigned long)paddr, size);
-        if (kvaddr != NULL)
-                memset(kvaddr, 0, size);
+        if (kvaddr == NULL)
+                return NULL;
 
         /* This is bus address, platform dependent */
         *dma_handle = (dma_addr_t)paddr;